BMW M20

BMW M20 engine
Overview
Production1977–1993
Layout
ConfigurationStraight-6
Displacement2.0 L (1,991 cc)
2.3 L (2,316 cc)
2.5 L (2,494 cc)
2.7 L (2,693 cc)
Cylinder bore80 mm (3.15 in)
84 mm (3.31 in)
Piston stroke66 mm (2.60 in)
75 mm (2.95 in)
76.8 mm (3.02 in)
81 mm (3.19 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainSOHC
Combustion
Fuel typePetrol
Chronology
PredecessorNone
SuccessorBMW M50

The BMW M20 is a SOHC straight-six petrol engine which was produced from 1977 to 1993. It was introduced eight years after the larger BMW M30 straight-six engine, which remained in production alongside the M20.[1]

The first cars to use the M20 were the E12 5 Series and the E21 3 Series. The initial M20 model had a displacement of 2.0 L (122 cu in), with later versions having displacements of up to 2.7 L (165 cu in).[2]

The M20 began to be phased out following the introduction of the M50 engine in 1990. The final M20 engines were fitted to the E30 3 Series wagon (estate) and convertible model built in April 1993.[3]

The M20 was the basis for the BMW M21 diesel engine.[4] It is also loosely related to the BMW M70 V12 petrol engine.

  1. ^ "BMW M30". www.bmw-tech.org. Retrieved 2 December 2017.
  2. ^ "Engine Of The Day: BMW M20". www.jalopnik.com. 29 August 2009. Retrieved 18 September 2017.
  3. ^ "BMW 3 Series Touring (E30) (1988 - 1993)". autoevolution.
  4. ^ "Archived copy". Archived from the original on 2012-01-05. Retrieved 2012-06-05.{{cite web}}: CS1 maint: archived copy as title (link)